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Abstract: Environmental pollution caused by NOx emission from coal combustion is very severe, so it is of great necessity to develop clean coal technologies. To decrease NOx
emission of No.9 boiler of a power plant, a scheme with horizontal bias
combustion burners and offset mid-secondary air nozzles was proposed and
applied. By analyzing the experimental results of the retrofitted
boiler, it is found that the effect of offset angles of mid-secondary
air nozzles on flow field in a furnace is great. The simulation and
experimental results show a good agreement. The results illustrate that
the vortex diameter of the secondary air is bigger than that of the primary air, which forms a better effect of air-surrounding fuel and is beneficial to de-crease NOx emission.
Key words: Boiler Mid-secondary air
Numerical simulation Experiment study
CLC No: TK224
国家重点基础研究发展计划(973计划, 2006CB200303)、国家电力公司重大科技项目(KJ00-02-16-1)和哈尔滨工业大学优秀团队支持计划资助项目. Received 20060926, received in revised form 20070315
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